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Finding the Fourth Proportional to 172.22, 256.79 and 170.09

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Solution

The fourth proportional to 172.22, 256.79 and 170.09 is: 253.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.22 : 256.79 = 170.09 : x
  2. Step 2: Convert to fraction form
    172.22/256.79 = 170.09/x
  3. Step 3: Cross multiply
    172.22x = 256.79 × 170.09
  4. Step 4: Simplify right side
    172.22x = 43,675.28
  5. Step 5: Solve for x
    x = 43,675.28/172.22
  6. Step 6: Final answer
    x = 253.61

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.